Stump-extractor



UNITED STATES PATENT oEEIoE.

CALEB BATES, OF KINGSTON, MASSACHUSETTS.

STUMP-EXTRACTOR.

Specification of Letters Patent No. 27' ,879, dated April 17', 1860.

To aZZ whom it may concern:

Be it known that I, C. BATES, of Kingston, in the county of Plymouth and State of Massachusetts, have invented a new and Improved Device for Extracting Stumps, Raising lVeights, and for like Purposes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in whichj Figure l, is an elevation of my invention-- shown in a suspended state ready for use. Fig. 2, a detached side sectional view of the same, taken in the line ai, Fig. 3. Fig. 3, a detached horizontal section of the saine, taken in the line y, y, Fig. l.

Similar letters of reference indicate corresponding parts in the several figures.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, Fig'. l, represents a framing which may be a simple t-ripod or three supports a, a, a, connected at their upper ends by a joint Z), and secured in a proper position by braces c, the supports admitting of being folded together when the braces are removed.

To the pintle of the joint Z) a swinging staple CZ is attached, and from this staple two rods e are suspended each of which has a circular eye f at its lower end. The two rods e, may be formed of one piece bent at the center and passed through the staples (Z. The eyes f, 7L', of the rods e form bearings, for knife-edged trunnions g, g, which project from the sides of a cast-iron head` B, at corresponding points, See Fig. 3. The head B is simply a bar having an arm or lever C attached to each end, said arms or levers being of any convenient length and having handles D secured to their ends at right angles. At the center of the head B, there is a vertical square opening h which extends entirely through the head. In this opening ZL two pawls E, F, are tted said pawls being in the formy of loops or links as shown clearly in Fig. 3, and one E smaller than the other F, so that they may cross each other or one pass through the other, as clearly shown by the dotted lines in Figs. l and 2. The upper ends of the pawls E, F, are tted loosely in bearings on the upper surface of the head B the pawls being provided with suitable j ournals c' which are retained in their bearings by rods y', said rods passing through vertical projections Zr, on the upper surface of the head B.

G is a rack bar which is provided with two racks Z, Z, at opposite sides of it. These racks are provided with teeth of equal size, but the faces of the teeth of one rack are in lines or planes which cross the centers of the teeth of the other rack as shown by the dotted lines mi in Fig. l. The rack bar Gr passes upward through the crossed pawl E, F, so that each pawl will engage with the rack that is at the side of the bar 0pposite to that which faces its journals the pawl E engaging with the rack Z, and the pawl F engaging with the rack Z. See Figs. l and 2.

To the under side of the head B a curved bar H is attached, said bar being slotted centrally and in line with the ope-ning ZL, of head B as shown at n Fig. 2, to form a guide for the rack bar G. The projections K, K, also form guides for the rack bar and so do projections 0, 0, at two opposite sides of the opening Zz.. At the lower end of the rack bar G a hook p is formed.

The operation is as follows: The framing A has its legs or supports a distended and secured in proper position by the braces c. The rods e are then fitted to the staple CZ, and the head B secured to the rods e, the knife edged trunnions g, g, being tted in the eyes f, The pawls E, F, are then crossed, and the rack bar Gr fitted between them as shown clearly in Fig. 2, and the device is ready for use. If a stump is to be extracted a chain is secured around and to it in a suitable way said chain being attached to the hook p as shown in red Fig. l. The operators then grasp the handles D, D, and work the arms or levers C, C, up and down and the pawls E, F, engage alternately with racks Z, Z. Each pawl as it risesengaging with its rack, and consequently elevating the rack bar G. As t-he head B is vibrated it will be seen that the relative position of the journals z' of the pawls E, F, the trunnions g, and the point of contact of the pawls and their racks Z, Z, change, and this change produces a progressive power; for as the operating pawl approaches its culminating point its journals z' approach a plane indicated by a* at Fig. 2, which intersects the points of contact of the operating pawl and its rack, and the bearing edges of the trunnions g, g. The lifting power therefore increases from the commencement to the termination of each vibration the speed of course correspondent-ly decreasing. This is essential for in operating the arms or levers C, C, the power of the operators cannot be so advantageously applied as the levers approach their culminating points and the increasing leverage compensates for this disadvantage. By having the rack Z, Z, arranged With the faces of the teeth of one rack in lines or planes Which cross or intersect the centers of the teeth of the other rack, the rack bar is raised the distance of just haltl a tooth at each movement of the head and good sized holding teeth are obtained With a limited length of vibration of the head B.

The machine as will be seen may be readily transported from place to place as it admits of being taken apart and placed Within a small compass. The several parts may also be adjusted together, and the device tted up in Working order very expediently.

Having thus described my invention what I claim as new and desire to secure by Let-- ters Patent isl. The employment of the crossed pawls E, F, in combination with the rack bar G, head B, and levers C, C, as and for the purpose herein shown and described.

2. I also claim the arrangement of the pivots or pins on which the pavvls E, F, turn, above the plane of the bearing edges of the trunnions g, g, so that the fulcra ot' the lifting levers will shorten as the levers descend, and the lifting power will be correspondently increased.

3. l further claim the employment of the knife edged trunnions g, g, in combination with the head B, and pendulous rods e, e, as and for the purpose herein Shown and described.

@ALE-B BATES. Witnesses:

JAS. N. SEVEN, JOSEPH STErsoN. 

